effect of magnetic field on seed germination and early growth of calendula officinalis l.

In order to study on effect of magnetic field on germination characteristicsand early growth of marigold (calendula officinalis l.) seeds an experimentwas carried out in laboratory conditions in arak university of iran. seedswere magnetically exposed to magnetic field strengths, 100 or 200 mt fordifferent periods of time; d1 (control), d2 (1 h), d3 (6 h), d4 (12h), d5 (24 h)and d6 (continuous). mean germination time (mgt) and the time required toobtain 10, 25, 50, 75 and 90% of seeds to germinate were calculated. the germinationtime for each treatment were in general, higher than control values,in the other word in treated seeds time required for mean seed germinationtime increased nearly 4 hours in compared non treated control seeds. t10 fordoses d3, d4 and d5 significantly higher than the control values. meangermination time significantly increased when the time of seed exposed atmagnetic field treatments increased, about 3 and 2 hour, respectively. accordingto experiment results of seedling dry weight (sldw), seed resource depletionpercentage (srdp) and shoot length (stl) showed more decrease withincreasing of the exposure time in the magnetic field.